In pictures: 15th International Energy Forum in Algiers

Oil prices rose modestly ahead of a meeting of producers from the Organisation of the Petroleum Exporting Countries (OPEC) cartel and Russia in Algeria on September 28 that could agree to cap supplies

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Algerian Prime Minister Abdelmalek Sellal (C) poses with oil ministers from OPEC member states and other officials attending the opening session of the 15th International Energy Forum in Algiers on September 27, 2016. Oil prices rose modestly ahead of a meeting of producers from the Organization of the Petroleum Exporting Countries (OPEC) cartel and Russia in Algeria on September 28 that could agree to cap supplies. (Ryad Kramdi/AFP/Getty Images)

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Saudi Energy Minister Khaled al-Faleh attends the 15th International Energy Forum in Algiers on September 27, 2016, on the eve of an informal OPEC meeting the next day. Saudi Arabia's energy minister said he was optimistic that OPEC oil ministers would reach a 'common view' on the international market at their meeting in Algiers on September 28. (Ryad Kramdi/AFP/Getty Images)

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France's Environment Minister, Segolene Royal (L), Algerian Energy Minister Noureddine Boutarfa (C) and Emirati Energy Minister Suhail al-Mazrouei pose for a group picture during the opening session of the 15th International Energy Forum in Algiers on September 27, 2016. Oil prices rose modestly ahead of a meeting of producers from the Organization of the Petroleum Exporting Countries (OPEC) cartel and Russia in Algeria on September 28 that could agree to cap supplies. (Ryad Kramdi/AFP/Getty Images)

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Venezuelan Oil Minister Eulogio del Pino (C) walks alongside Saudi Arabia's Energy Minister Khalid al-Falih during the opening session of the 15th International Energy Forum in Algiers on September 27, 2016. Oil prices rose modestly ahead of a meeting of producers from the Organization of the Petroleum Exporting Countries (OPEC) cartel and Russia in Algeria on September 28 that could agree to cap supplies. (Ryad Kramdi/AFP/Getty Images)

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Iranian Oil Minister Bijan Zanganeh talks to reporters on the sidelines of the 15th International Energy Forum in Algiers on September 27, 2016. Iran is not ready to agree to an oil output freeze, he said on the eve of an informal OPEC meeting in Algeria's capital. (Ryad Kramdi/AFP/Getty Images)

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Algerian Prime Minister Abdelmalek Sellal attends the opening session of the 15th International Energy Forum in Algiers on September 27, 2016. Oil prices rose modestly ahead of a meeting of producers from the Organization of the Petroleum Exporting Countries (OPEC) cartel and Russia in Algeria on September 28 that could agree to cap supplies. (Ryad Kramdi/AFP/Getty Images)

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Participants attend the opening session of the 15th International Energy Forum in Algiers on September 27, 2016. Oil prices rose modestly ahead of a meeting of producers from the Organization of the Petroleum Exporting Countries (OPEC) cartel and Russia in Algeria on September 28 that could agree to cap supplies. (Ryad Kramdi/AFP/Getty Images)

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Venezuelan Oil Minister Eulogio del Pino attends the opening session of the 15th International Energy Forum in Algiers on September 27, 2016. Oil prices rose modestly ahead of a meeting of producers from the Organization of the Petroleum Exporting Countries (OPEC) cartel and Russia in Algeria on September 28 that could agree to cap supplies. (Ryad Kramdi/AFP/Getty Images)

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France's Environment Minister Segolene Royal attends the opening session of the 15th International Energy Forum in Algiers on September 27, 2016. Oil prices rose modestly ahead of a meeting of producers from the Organization of the Petroleum Exporting Countries (OPEC) cartel and Russia in Algeria on September 28 that could agree to cap supplies. (Ryad Kramdi/AFP/Getty Images)

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US Department of Energys Assistant Secretary for International Affairs, Jonathan Elkind, attends the opening session of the 15th International Energy Forum in Algiers on September 27, 2016. Oil prices rose modestly ahead of a meeting of producers from the Organization of the Petroleum Exporting Countries (OPEC) cartel and Russia in Algeria on September 28 that could agree to cap supplies. (Ryad Kramdi/AFP/Getty Images)